horace stevens



1. H. STEVENS.

Fire'AIarm Telegraph.

Nb. 69,503. 'Patented om. 1, 1867.

fia m9223071 @einer "tette @anni @frn IMPROVEMENT IN FIR-ALARMTELEGRAPHS.

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TO ALL WHOM IT HAY GONGERN: i

Be it known that I, J. HORACE STEVENS, of Boston, in thecounty otSuffolk, and State of Massachusetts, hnve invented a new and usefulImprovement in Fire-Alarm Telegraphs; and I do hereby declare that thefollowing is a. full, clear, and exact description of the constructionand operation ofthe same, reference being had to the accompanyingdrawings, forming a part of this specification, in which Figure 1represents a complete fire-alarm telegraph circuit, botl'oftice andout-of-door connections.

Figure 2 the lower or reversing side of the rheotrope, and

Figure 3 the upper side of the rheotrope. v

My invention consists in so connecting an automatic signal-box, as nowin use, with the circuit passing through the rheotrope at the centralstation, that the rheotropc will be started by the electric current, andthe bells or gongs in the circuit will all be struck, as indicated bythe breaks on the circuit-wheel of the signal-box, while at any desiredtime the rheotrope maybe thrown out of the circuit, so that the line maybe used or tested Without ringing the bells or gong-s.

In the drawings, A is the battery for Working the circuit. B B arcswitches, which, in the position shown, send the current through therheotrope, but, if moved to knobs C C, cut out the -rheotropeconnections. D is the rheotrope cylinder, to be moved by clockwork, orits equivalent, said clock-work being set in motion by start-magnet E,on the breaking and closing the circuit by signalbox K. F is aWriting-key, G an oice callbell, H an office gelvanometer. I is thecombination ot' permanent magnet on afmovable arm and reversibleelectro-magnets, operating the striking apparatus of bells and gcngs. Kis the automatic signal-box, and L L L L are the springs of therheotrope, connected by wires M with the switch-knobs, writing-key,start-magnet, and signal-box.

When the signal-box K is put in operation each break and closing ofthevcircuit causes an operation ofthe start-magnet E, which allows theclock-Work to revolve the rhe'otrope, and byemeans of thereversing-magnets at I delivers one stroke upon the bell or gong. But ifwe remove theswitches B to knobs C the rheotrope connect-ions are cutout of the circuit, and the signal-box may be put in operation, the keyF used for writing, the lines tested for grounds, and all importantoperations carried on, without the possibility of letting oi the bellsor gongs, as these can only be struck by the operation and aid of. areversed current.

' I claim as my invention, and desire to secure by Letters Patent.-

1. The rheotrope Dand reversing-magnets I, in combination with eachother, when connected with and operated by signal-box K, substantiallyas described.

2. The arrangement and combination of the wires M M, switchesB, andknobs C, so as to include in or exclude from the circuit the rheotropeD, substantially as and for the purpose' described."

3. The described combination and arrangement of signal-box K,start-magnet E, rheotrope D, with its springs L and wires M, withswitches B and reversing-magnet J, substantially as and for the purposedescribed,

J. H. STEVENS.

Witnesses:

Trios. Wn. CLARKE, E. A. RAYMOND.

